Vol. 11, Issue 11 (2022)

Anthracnose and die-back diseases of mango were noticed as endemic to the konkan region of Maharashtra. The causal organisms were isolated from leaf and twig samples showing typical symptoms of anthracnose and die-back diseases. The pathogens were identified as Colletotrichum gloeosporioides and Lasiodiplodia theobromae on the basis of morphological characteristics. Out of the seven media tested to study cultural characteristics of the test pathogens, potato dextrose agar and oat meal agar were found to be the best media which recorded maximum (90 mm) mycelial growth of C. gloeosporioides and L. theobromae respectively. Under in vitro studies Trichoderma harzianum recorded maximum growth inhibition (73.11% and 72.00%) of C. gloeosporioides and L. theobromae respectively, followed by T. longibrachiatum (50.44% and 49.33%) and T. koningii (41.78% and 44.22%). When three Trichoderma species were evaluated under field conditions, T. harzianum was found to be effective with maximum (63.84%) per cent disease control of C. gloeosporioides. It was followed by T. longibrachiatum (56.92%) and T. koningii (39.23%). Similarly in case of L. theobromae, T. harzianum recorded maximum (57.88%) disease control followed by T. longibrachiatum (42.12%) and T. koningii (30.54%). The spray of three Trichoderma spp. under field conditions resulted in reduced postharvest rot of mango fruits. It was observed that the trees sprayed with T. harzianum displayed maximum (61.25%) per cent disease control followed by T. longibrachiatum (51.25%) and T. koningii (36.88%). Fruit dipped treatment of T. harzianum 10% for 30min was found the best among all the treatments and gave maximum (79.31%) disease control. While T. longibrachiatum at the same concentration and time period displayed 68.96% PDC. However, PDC exhibited by T. koningii at aforesaid conditions was 58.62%.